How to keep a single activity instance but be able to update the view?

Question

In my situation, there is one case in which I need to make sure the activity only runs one at a time.

I found if I set the LauchMode of the activity, I

Answer 1

You can have an Activity with a manifest attribute of singleInstance. As soon as the activity is relaunched , onResume gets called. You can update the view with the new image and invalidate the older View.